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moby--moby/daemon/attach.go

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package daemon
import (
"io"
"time"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/daemon/logger"
"github.com/docker/docker/pkg/stdcopy"
)
// ContainerAttachWithLogsConfig holds the streams to use when connecting to a container to view logs.
type ContainerAttachWithLogsConfig struct {
InStream io.ReadCloser
OutStream io.Writer
UseStdin, UseStdout, UseStderr bool
Logs, Stream bool
}
// ContainerAttachWithLogs attaches to logs according to the config passed in. See ContainerAttachWithLogsConfig.
func (daemon *Daemon) ContainerAttachWithLogs(prefixOrName string, c *ContainerAttachWithLogsConfig) error {
container, err := daemon.Get(prefixOrName)
if err != nil {
return err
}
var errStream io.Writer
if !container.Config.Tty {
errStream = stdcopy.NewStdWriter(c.OutStream, stdcopy.Stderr)
c.OutStream = stdcopy.NewStdWriter(c.OutStream, stdcopy.Stdout)
} else {
errStream = c.OutStream
}
var stdin io.ReadCloser
var stdout, stderr io.Writer
if c.UseStdin {
stdin = c.InStream
}
if c.UseStdout {
stdout = c.OutStream
}
if c.UseStderr {
stderr = errStream
}
return daemon.attachWithLogs(container, stdin, stdout, stderr, c.Logs, c.Stream)
}
// ContainerWsAttachWithLogsConfig attach with websockets, since all
// stream data is delegated to the websocket to handle there.
type ContainerWsAttachWithLogsConfig struct {
InStream io.ReadCloser
OutStream, ErrStream io.Writer
Logs, Stream bool
}
// ContainerWsAttachWithLogs websocket connection
func (daemon *Daemon) ContainerWsAttachWithLogs(prefixOrName string, c *ContainerWsAttachWithLogsConfig) error {
container, err := daemon.Get(prefixOrName)
if err != nil {
return err
}
return daemon.attachWithLogs(container, c.InStream, c.OutStream, c.ErrStream, c.Logs, c.Stream)
}
func (daemon *Daemon) attachWithLogs(container *Container, stdin io.ReadCloser, stdout, stderr io.Writer, logs, stream bool) error {
if logs {
logDriver, err := daemon.getLogger(container)
if err != nil {
return err
}
cLog, ok := logDriver.(logger.LogReader)
if !ok {
return logger.ErrReadLogsNotSupported
}
logs := cLog.ReadLogs(logger.ReadConfig{Tail: -1})
LogLoop:
for {
select {
case msg, ok := <-logs.Msg:
if !ok {
break LogLoop
}
if msg.Source == "stdout" && stdout != nil {
stdout.Write(msg.Line)
}
if msg.Source == "stderr" && stderr != nil {
stderr.Write(msg.Line)
}
case err := <-logs.Err:
logrus.Errorf("Error streaming logs: %v", err)
break LogLoop
}
}
}
daemon.LogContainerEvent(container, "attach")
//stream
if stream {
var stdinPipe io.ReadCloser
if stdin != nil {
r, w := io.Pipe()
go func() {
defer w.Close()
defer logrus.Debugf("Closing buffered stdin pipe")
io.Copy(w, stdin)
}()
stdinPipe = r
}
<-container.Attach(stdinPipe, stdout, stderr)
// If we are in stdinonce mode, wait for the process to end
// otherwise, simply return
if container.Config.StdinOnce && !container.Config.Tty {
container.WaitStop(-1 * time.Second)
}
}
return nil
}